Valve spring retainer issue?

My 95 Escort has had a lifter tick that would go away every once in a while, and was never noticable except at idle rpm. Being concerned about lack of oil flow to the valve(s) that where ticking, I took a look under the valve cover to find what looks like a spring retainer stuck next to one of the springs. The intake and exhaust valves on cylinder #3 were both missing this almost round piece that has a lip on one end that rests on the lifter and a raised section around the open middle that looks like the rocker arm tightens up against it. It's definitely not a keeper based on all the pictures I've seen online. And any info I've been able to gather on the term spring retainer hasn't produced any products that look remotely like what i have. There also looks like there is supposed to be a zig-zag shaped retaining clip that holds this keeper to the lifter and cylinder head. the rocker arm doesn't have any vertical play, but has substantial horizontal play compared to the ones that have this retainer, which have no play. Car runs fine but I certainly don't need to be messing up lifters and rocker arms in the future by driving like this any longer. The worst part is I wonder where the other retainer went.